Agree.
U cant have a full party of the same archer class coz its stupid.
U need some other classes for suport and passives. (Like u said counter rapid shot and trickster)
Mi siege party is almost always like this: (i play GH)
2 GH/1 HE/1 SR/1 WK/1 BD/1 BP/1 EE/1 Trickster (maybe change trickster for sws)
U cant use a bot to "win" in oly since there are no pvp bots :P.
The best u can get is some bots that autotarget and autopot, but as far as i know thats the best u can get.